and I must say that it is my favorite today if we put aside the 1518 and 2499.
This is in many ways and also in terms of aesthetics close to perfection as far as I'm concerned. It is very difficult for traditional brands to modernize their collections and this one is a masterpiece in that field. That's what makes also the aesthetical difference with the 5970. I don't consider one better than the other.
The 5970 is aesthetically more in the "older" period whereas the 5270 has brought the complication in today. It is not modern but it has modernized a traditional design. That's the difficulty and that's why I think this reference is a masterpiece.
Take your time, consider eventually the 5970 as well (as you didn't mention it in your post), but it is important to remain objective on your side (because it is you who is going to pay) and keep a sort of independence from what we read on forums.
It is important to read every opinions here as there are knowledgeable people, owners and members around the same passion but it is also good imho to have different views on a watch.
Otherwise we would only wear 5711, 5110, 5070 and 5970 watches :p
The 5270G 3rd series is a watch I'm considering seriously too (but not the only one).
I have no cons, even the small subdial hands that I prefer that way instead of "Leaf" because it avoids bringing to much shapes on the dial as there are already several scales (scales positions that I think are a work of art). The only personal thing I would change is the design of the crown's notches.
Keep us informed
Best, Mark